Low thermal expansion ceramic and process

Details Low thermal expansion ceramic and process Low thermal expansion ceramic and process

1980-12-15

1981-11-17

Vertiz, O. R.

Stock material or miscellaneous articles

Composite

Of silicon containing

428448, 428454, 501141, 501149, C04B 3300, C04B 3304, C04B 3324

Patent

active

043012140

ABSTRACT:
A ceramic product having an expansion coefficient from about 1.0.times.10.sup.-6 .degree.C. to about 2.5.times.10.sup.-6 .degree.C. containing a sintered mixture of spodumene and clay is described. The sintered mixture also includes iron oxide in an amount from about 1.0% to about 7.0% by weight of the total sintered mixture. The final product includes a .beta. spodumene solid solution and mullite, and has a mullite content of less than 10% by volume. The presence of iron oxide in the sintered mixture reduces the formation of mullite during the formation of .beta. spodumene and thus reduces the expansion coefficient of the final product. The process for preparing the ceramic products described herein includes providing an intimate mixture of 40% by weight to 60% by weight of spodumene and 40% by weight to 60% by weight of clay and heating the mixture in the presence of iron oxide at a suitable time and temperature, within a range from cone 5 to cone 10 and preferably within a range from cone 6 to cone 9.
The ceramic body is coated with a suitable glaze which preferably contains from about 70% by weight to about 90% by weight of spodumene and from about 10% by weight to about 30% by weight of talc and 20% by weight to about 10% by weight of whiting. The glaze composition also includes from about 1.0% by weight to about 7.0% by weight of iron oxide. The base portion of the ceramic products of this invention is optionally coated with a suitable terra sigillata for aesthetic purposes and also to avoid sticking of the product to the furnace during the firing process. The terra sigillata composition typically contains from about 10% by weight to 35% by weight of spodumene, 65% to 90% by weight of clay and 1% by weight to 7% by weight of iron oxide.
Because of their low expansion coefficients the products of the invention are useful for a multitude of household purposes. They can readily withstand the thermal shock encountered when exposed to the extreme heating or cooling conditions normally present in household environments.

REFERENCES:
patent: 3279930 (1966-10-01), Van Der Beck, Jr.
patent: 3650817 (1972-03-01), Motoyuki
patent: 3817763 (1974-06-01), Smyser

Affiliated with

Also associated with

Rating

Low thermal expansion ceramic and process does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Low thermal expansion ceramic and process, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Low thermal expansion ceramic and process will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1292948